Hydraulic switch for a pump

Details Hydraulic switch for a pump Hydraulic switch for a pump

1979-12-06

1982-08-24

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

200 819M, 200 84C, 417 53, F04B 4904

Patent

active

043458793

ABSTRACT:
An hydraulic switch (10) and method for controlling the starting and stopping of a pump is disclosed. Switch (10) has an aperture (34) in the base (32) of a reservoir (28). Liquid enters aperture (34) thereby raising float (38) which operates switching mechanism (26) to start pump motor (20). As liquid is pumped passed impeller (22) along flow path A, some of the liquid is forced into conduit (36) leading to reservoir (28). The liquid flowing through conduit (36) keeps reservoir (28) filled. Consequently, float (38) remains in an elevated position keeping switch mechanism (26) on. Float (38) does not descend until liquid ceases to be pumped and stops flowing through conduit (36). Then, as liquid drains from reservoir (28) through aperture (34), float (38) drops thereby causing switching mechanism (26) to switch motor (20) off.

REFERENCES:
patent: 2840000 (1958-06-01), Gramenzi
patent: 3316845 (1967-05-01), Schumann
patent: 3748066 (1973-07-01), Sully et al.
patent: 3941073 (1976-03-01), Ridgeway
patent: 3963374 (1976-06-01), Sullivan
patent: 4081639 (1978-03-01), Tice
patent: 4118150 (1978-10-01), Hope et al.
patent: 4186419 (1980-01-01), Sims
Gems Technical Bulletins: Series FS-200/400, Flow Switch for Industrial Shower, Series FS-550, Single Station Level Switches, Level Switch in Air Pollution Control Equip.

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